Machine for grinding lawn-mowers.



W. J. MANDLBY.

MACHINE FOR GRINDING LAWN MOWERS.

APPILIGATION FILED FEB. 17, 1912.

1 943,948. I Patented Npv.12,1912.

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Witnesse Inventor. #CM. #2-

W. J. MANDLEY. MACHINE FOR GRINDING LAWN MOWEES.

APPLICATION FILED FEB.17, 1912.

1,043,948, Patented Nov. 12, 1912.

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Witnesses.- I tor, M 1 gm? @F if WILLIAM JOHN MANDLEY, 0F SHELBURNE,ONTARIO, CANADA.

MACHINE FOR GRINDING LAWN-MOWERS.

Specification of Letters Patent.

Application filed February 17, 1912.

Patented Nov. 12, 1912. Serial No. 678,357.

To all whom it may concern:

Be it known that I, TILLIAM JOHN MAND- LEY, a subject of the King ofGreat Britain, and. resident of the town of Shelburne, in the county ofDufterin, in the Province of Ontario, in the Dominion of Canada, haveinvented certain new and useful Improvements in Machines for GrindingLawn- Mowers, of which the following is a specification.

The invention relates to improvements in machines for grinding lawnmowers, as described in the following specification and illustrated inthe accompanying drawings that form part of the same.

The invention consists essentially in the novel construction andarrangement of parts, whereby the mower is adjustably supported from amovable carriage arranged above the grinder wheel so that the cuttingedges of the lower cutter bar and reel may be brought into engagementwith the grinder wheel to effect an accurate grinding thereof.

The objects of the invention are, to devise a grinder machine of simple,strong and durable construction upon which the cutter blades of lawnmowers may be quickly and accurately ground without the necessity of themower being taken apart and which may be utilized for general purposesand may be manufactured at very low cost.

In the drawings, Figure 1 is a perspective view of a machine constructedin accordance with this invention. Fig. 2 is a side elevational view ofthe upper portion of the machine showing the mower in section with thebottom cutter blade in position for grinding. Fig. 3 is a sideelevational view of the upper portion of the machine showing the mowerin section with one of the reel blades in position for grinding.

Like numerals of reference indicate cor responding parts in each figure.

Referring to the drawings, 1 is the main frame of the machine comprisinga narrow rectangular frame 2 having the legs 3 secured thereto.

4 are a pair of vertically arranged standards rigidly secured to thesides of the frame 2 and having the journals 5 at the bottom endsthereof supporting the axis (3 of the main driving wheel 7, said drivewheel being operated by the cranks 8, connecting rods 9 and pedals 10.

11 are journal brackets adjustably secured to the upper ends of thestandards 4 and supporting the spindle of the grinder wheel 12.

13 is a belt connecting the drive wheel 7 with the grinder wheelspindle.

14 is a rectangular frame extending in front of the grinder wheel and isadjustably secured to the standards 4 by the bolts 15 extending throughthe slots 16 in the extremities of said frame.

17 is a flat bar pivotally supported on a bolt 18 extending through thecenter of the frame 14, said bar having its upper end 19 beveled off toeach side from a central point and arranged close to the grinder wheel.

20 is a bar having a longitudinal slot 21 therein and is adjustablysecured to the bolt 18 on the front side of the frame 14, said barhaving a forwardly bent upper end forming a supporting bracket 22.

23 is a frame secured to the inner sides of the standards 4 above theframe 14 and extending rearwardly of the grinder wheel and havingv theoffset portion 24 to allow the belt 13 to pass.

25 is a fiat bar adjustably secured to the frame 23 by a suitable boltand extending upwardly therefrom and bent forwardly over the grinderwheel 12 and having its front end 26 beveled off to each side from acentral point, said point extending close to the point of the bar 17 28is a flat bar secured to the bar 25 and bent closely thereto having theforward end 29 split longitudinally and having one side thereof bentdownwardly to meet the upper side of the bar 25, the extending finger 30with the downwardly bent portion 29 forming a guide-way adapted toreceive the reel blade of the mower.

31 are a pair of uprights rigidly secured to the sides of the frame 2 tothe rear of the standards 4 and supporting a pair of cross bars 32 and33 extending laterally across and beyond the sides of the frame, saidcross bars being braced at their extremities by the bars 34.

35 and 36 are lengths of pipes or rods secured to the forward and uppersides respectively of the cross bars 32 and 33.

37 is a carriage formed of a rigid frame having the metal strips 38secured to the rear side thereof and bent to form the loopshaped ends 39and 40, at the top and bottom respectively.

41 and 42 are grooved rollers ournaled in the looped members 39 and 40respectively and resting upon the pipes 36 and 35'. The upper loopedends 39 are arranged in acute angular relation to the uprights of thecarriage and the lower looped ends 40 are arranged tilted slightly fromthe horizontal. The carriage rests upon the track-way and is free totravel back and forth thereon but maybe easily and quickly lifted offwhen desired. V

43 are a pair of rectangular shaped brackets rigidly secured to theforward side of the carriage 37 at the top thereof and extendingforwardly therefrom.

44 is a rectangular frame looped around the outer ends of the brackets43 and rigidly secured thereto. The ends of said frame extend slightlybeyond the sides of said brackets.

45 are rods extending through the projecting ends of the frame 44 andformed with cranked upper ends and threaded lower ends.

46 is a bar extending between the threaded lower ends of the crankedrods 45 and supported upon the nuts 47 threaded on said cranked rods,said nuts being held from rotation by the downwardly turned ends of saidbar.

48 are rods formed with eye-shaped upper ends extending through thebrackets 43 close to the carriage and held at the lower end by theangular shaped brackets 49 secured to said carriage.

("JO-are a pair of frames each formed of a length, of flat bar andsupported upon and secured to the cross bar 46 and having their largerearward ends sliding on the rods 48, said frames being rigidlyconnected together at their rear ends by the cross bar 51. The upperportion of the frames 50 is bent downwardly and forwardly to form theforwardly projecting guide-ways 52. j

53 is a bar bent inwardly at the ends and supported upon its edges inthe guide-ways 52. the looped ends extending beyond the guide-ways andhaving threaded nuts arranged therein through which the horizo'n tallythreaded adjusting rods 54 extend, said adjusting rods being rotatablyheld in the projecting ends of the rear cross bar 51 and having crankedends 55.

56 are bolts extending through the guideways 52 close to the ends andhaving suitable wing nuts thereon adapted to squeeze the guide-waystightly upon the adjustable cross bar 53 to hold it rigidly.

57 are a pair of hook shaped members rigidly secured to the adjustablecross bar 53 and extending downwardly therefrom, the books 57 areadapted to receive the wheel axle of the mower and form an adjustablesupport to suspend the mower above the grinder wheel.

V 58 is a forked bar projecting upwardly from the carriage 37 centrallyof its width and having its upper forked end bent rearwardly.

59 is a rod threaded at one end and extending through the fork 58 andhaving a suitable thumb nut thereon, said rod having a c(ilamp 60loosely supported on its outer en In the use of this device the operatorlifts the mower intoplace, placing the axle thereof in the hooks 57. Theclamp 60 is then secured to the handle of the mower and as it isdesirable to grind the lower cutter knife first, the bolt 18 in theframe 14 is loosened and the bar 17 is swung laterally moving the upperend 19 thereof away from the grinder wheel. The rod 59 is then adjustedso that the lower cutter blade of the mower is brought into properrelation with the grinder wheel and the bar 20 is then adjusted so thatthe outwardly bent upper portion 22 engages the cutter bar holder forming a rest. V

In the proper setting of the machine the hook carrying cross bar 53 maybe adjusted forwardly or rearwardly by means of the adjusting rods 54and the frames supporting said hook carrying member may be adjustedvertically by means of the threaded cranks 45. lVhen the properadjustment is obtained the cross bar is locked and held rigidly bythebolts 56. The operator sitting on the seat 61 at the rear end of themachine rotates the grinder wheel by means of the pedals 10 and movesthe carriage 37 back and forth on its track-ways bringing the fulllength of the cutter blade into engagement with the grinder wheel, asuitable handle 62 being secured to the rear of said carriage. When thelower cutter bar is being ground, one of the cutter blades ofthe reelextends under the finger 30 at the forward end of the curved bar 28extending over the grinder wheel and as the carriage is moved back andforththe guide formed by said bar turns the reel on its journal so as toprevent the reel blades from interfering or coming in contact with thegrinder wheel. been properly ground the rod 59 is adjusted to swing themower outwardly. The bar 20 is then loosened and dropped downwardly asshown in Fig. 3 and the bar 17 raised to.

its upper position. One of the cutter blades of the reel is insertedbetween the adjacent points of the bar 17 and the bar 25. The pointedguides allow the curved blade perfect freedom of movement. The severalparts may then be adjusted to bring the reel blade into proper positionfor grinding and the carriage then is operated backhand forth as thegrinder wheel is rotated. hen the adjustment is made for one blade theother blades are groundto the same adjustment,

W hen the lower cutter blade has thus insuring perfect grinding of thereel blades to effect the proper cutting.

It will be readily seen that a machine such as described renders thework of grinding lawn mowers very simple and obviates any necessity fortaking them apart. The cost of grinding is therefore reduced to aminimum.

The machine may be very quickly con verted to an ordinary grinder bysimply lifting off the carriage and removing the upright frame.

lVhat I claim as my invention is:

1. In a machine for grinding lawn mowers, the combination with asuitable frame and grinder wheel, of a carriage movably supported abovethe grinder wheel, and adjustable means supported on said carriageadapted to engage the frame of the mower suspending the said mower abovethe grinder wheel to bring the cutter bars into contact therewith.

In a machine for grinding lawn mowers, the combination with a suitableframe and grinder wheel, of a carriage movably supported on said frame,a movable frame supported from said carriage and adapted to be adjustedvertically, and horizontally adjustable means supported on saidvertically adjustable frame adapted to engage the mower frame to supportthe machine above the grinder wheel bringing the blades into contacttherewith.

3. In a machine for grinding lawn mowers, the combination with asuitable frame and grinder wheel, of a carriage movably supported abovethe grinder wheel, vertical guideways supported on said carriage, aframe slidably arranged on said vertical guide-ways and havinghorizontal guideways therein, a rigid frame'arranged above saidadjustable frame, threaded members rotatably supported in said rigidframe and having their threaded ends connected to said adjustable frame,a horizontal bar slidably arranged in said horizontal guide-ways andarranged transversely in relation to the grinder wheel frame, means foradjusting said horizontal bar, and hook members sup ported from saidhorizontal bar and adapt ed to support the mower above said grinderwheel.

4:. In a machine for grinding lawn mowers, the combination with asuitable frame and grinder wheel, of a carriage movably supported abovethe grinder wheel, vertical guide-ways supported on said carriage, a

frame formed of a pair of bracket shaped members slidably arranged onsaid vertical guide-ways, each of said bracket portions having loopedends extending horizontally and formed with parallel top and bottomsides forming horizontal guide-ways, a cross bar extending transverselythrough said looped ends and having nuts secured in the outer ends,threaded crank members horizontally arranged and extending through saidthreaded nuts and adapted to move said transverse bar horizontally,bolts extending through the looped ends of said brackets and adapted toclamp said transverse bar, hook members carried by said transverse baradapted to suspend the mower, and means for adjusting said adjustableframe vertically.

5. In a machine for grinding lawn mowers, the combination with asuitable frame and grinder wheel, of a transverse trackway rigidlysupported above said frame, aearriage supported on said track-way, meansadjustably supported on said carriage for suspending the mower above thegrinder wheel, an adjustable rod adapted to be clamped to the mowerhandle and having an adjusting nut threaded on one end thereof, and afork member rigidly secured to said carriage and extending upwardlytherefrom and adapted to receive said adjustable rod.

6. In a machine for grinding lawn mowers, the combination with asuitable frame and grinder wheel, of a supplementary frame rigidlysecured to said grinder wheel frame and extending upwardly therefrom andhaving transverse members extending beyond the sides of said frame, atrack arranged on the top of the upper transverse member, a trackarranged on the front side of the lower transverse member, a carriageframe, a plurality of looped brackets secured to said carriage frame,grooved wheels journaled in said brackets and running on said tracks andadapted to support said carriage frame, and means adjustably arranged onsaid carriage frame for supporting the mower above the grinder wheel.

7. In a machine for grinding lawn mowers, a rigid frame, a pair ofstandards supported from said frame, a grinder wheel journaled betweensaid standards, an adjustable carriage supported on said frame andadapted to engage the frame of the mower suspending it above the grinderwheel, and a guide member adapted to engage one of the reel blades ofthe mower to cause said reel to rotate so as not to come in contact withthe grinder wheel as the mower is moved laterally in the grinding of thelower cutter blade.

8. In a machine for grinding lawn mowers, a rigid frame, a pair ofstandards supported from said frame, a grinder wheel journaled betweensaid standards, a movable carriage supported above the grinder wheel andadapted to adjustably suspend the mower, a flat bar bent in arc shapeextending over the top of said grinder wheel and having a pointedextremity, a bar adj ustably secured at the front side of said grinderwheel and extending upwardly and having a pointed end adapted to extendinto close proximity to the pointed end of the upper county of Dufierin,in the Province of Onguide, said pointed members forming a ta-rio, inthe Dominion of Canada, this secguide to hold the reel blade in properrela- 0nd day of February 1912. tion with the grinder Wheel in thegrinding \VILLIAM JOHN MANDLEY. thereof as the carriage is movedback andWVitnesses: forth. G. M. VANOH,

Signed at the town of Shelburne, in the I INEZ LAKING.

Copies of this patent may be obtained for 'five cents each, byaddressing the Gommissioner of Patents, Washington, D. 03

